# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0284062        0.00190502    
     0.460000          0.700000         0.0330367        0.00175653    
     0.700000           1.00000         0.0356576        0.00192232    
      1.00000           1.54000         0.0438629        0.00196139    
      1.54000           2.40000         0.0459558        0.00227724    
      2.40000           4.80000         0.0445782        0.00291989    
      4.80000           10.0000         0.0326199        0.00401649